[PATCH] fix build errors in kdevplatform-1.2.0

[Erik]

This patch fixes the following errors in kdevplatform 1.2.0 so that it 
can be built:
* Define metatypes in header files and include them instead of having 
multiple Q_DECLARE_METATYPE(TYPE) for the same TYPE (see 
http://www.mail-archive.com/kde-core-devel@kde.org/msg00416.html).
* Explicit static casts where needed according to the compiler.
* Define urlToData in one place only (a separate new header file).
* Rename one of the functions appendActions to appendContextMenuActions 
to make the signature unique.
* Add include guard to greputil.h
* Rename one of the structs Visitor to selfAnalysisVisitor to make the 
identifier unique.
* Use a unique include guard in appendlist_static.h (not the same as in 
appendlist.h)
* Undefine the macro "mix" after use to not pollute the namespace.

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